Optimization on the Extraction of Polysaccharides from Ginseng Using Uniform Design

Uniform Design was used to optimize the effects of processing parameters for extraction of polysaccharides from ginseng.Four independent variables including extraction time (min),solid:liquid ratio(g/mL),immersing time (min),and extraction temperature (℃) were study.The optimal conditions were determined and tri-dimensional response surfaces were plotted according to the mathematical models.The results indicated that extraction temperature variables markedly affect the polysaccharides yield.The predicted optimal polysaccharides yield was 49.51% under the optimum conditions:liquid:solid ratio of 1:35,immersing time of 135 min,water extraction temperature of 81 ℃,and water extraction time of 156 min.Under optimized conditions the experimental yield (49.29%) in agreement with the predicted yield.